What's the total number of words you could make from this list?From this page of words with 'j' as the 1st letter that end with 'up', you have 2 entries which are available.
How many letters are in the longest word on this page?There are 5 letters in the word 'jehup', that makes it the biggest word on this list.
What is the highest scoring word in Scrabble with the requested combination ?As there is just 2 combinations possible, your only feasible word is 'jehup' scoring 17 points.